/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

const promise = new Promise(function (resolve, reject) {
  let a = 'hello'
  resolve(a);
});
promise.then(function (value) {
  let b = 'lagou'
  return value + b
})
  .then(function (value) {
    let c = 'I ♥ U'
    console.log(value + c)
  });